FILE - In this Thursday, March 28, 2013, file photo, the National Shooting Sports Foundation headquarters are photographed in Newtown, Conn. The president and CEO of the National Shooting Sports Foundation said Friday, Nov. 22, 2013, in an exclusive interview with The Associated Press that the lobbying organization considered moving its offices from Newtown, Conn.

A report by the Connecticut State's Attorney's Office indicates that police officials may never determine shooter Adam Lanza's motive behind the shootings at Sandy Hook Elementary School, nearly one year ago.

The report includes findings from the investigation following the Dec. 14, 2012, shootings at the school in Newtown that left 26 people dead. The report aims to put together the grief-stained pieces of this act of violence, according to the National Journal.

"A 48-page report released Monday by Connecticut’s lead investigator in the case, State’s Attorney Stephen J. Sedensky III, said that Adam Lanza, 20, shot his mother four times with a .22-caliber rifle as she lay in bed in their Newtown home, then drove to Sandy Hook Elementary School, which he had once attended," the Washington Post reported.

The report further showed that Lanza forced his entry into the school, and used a Bushmaster XM15-E2S semiautomatic 5.56mm rifle to kill 20 children and six adults. Two others were also wounded before Lanza committed suicide with a Gock 10mm handgun, according to the Washington Post.

According to the Washington Post, “Unfortunately, that question may never be answered conclusively, despite the collection of extensive background information on the shooter through a multitude of interviews and other sources. The evidence clearly shows that the shooter planned his actions, including the taking of his own life, but there is no clear indication why he did so, or why he targeted Sandy Hook Elementary School."

According to an article from The Associated Press in the Deseret News, the report also gave insights into Lanza's character.

"(The) report offered a chilling portrait of 20-year-old Adam Lanza as a loner who was obsessed with violence and bound by ritualistic behavior," the article reported.

The Washington Post quoted the report as saying that Lanza had "an obsession with mass murders," including the April 1999 shootings at Columbine High School in Colorado. The investigation showed nothing, however, "that he intended to commit such a crime himself."

For the victims' families, the report offers little, if any, closure.

USA Today reported that Donna Soto — mother of Victoria Soto, a teacher and victim of the shooting — posted on her Facebook about the report.

"She said the report 'is yet another blow that our family has been dealt' and does not answer the family's questions: 'How can we live without Vicki? How do we celebrate Christmas without Vicki? How do we go on every day missing a piece of our family?’ ” according to USA Today.

The article said that the Soto family is unsure if it will ever find answers or make sense of this great tragedy.